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Medical Definition of Terminal sulcus
1. Sulcus terminalis linguae; a V-shaped groove, with apex pointing backward, on the surface of the tongue, marking the separation between the oral, or horizontal, and the pharyngeal, or vertical, parts, sulcus terminalis atrii dextri; a groove on the surface of the right atrium of the heart, marking the junction of the primitive sinus venosus with the atrium. Synonym: terminal sulcus. (05 Mar 2000)